October 2026
Largest Quantum Computing Public Companies in the US
Benchmark revenue and EBITDA valuation multiples for public comps like
IonQ, Littelfuse, D-Wave Quantum, Rigetti and QuantumScape.
 | IonQ Inc sells access to several quantum computers of various qubit capacities and is in the process of researching and developing technologies for quantum computers with increasing computational capabilities. The company currently makes access to its quantum computers available via cloud platforms and also to select customers via its own cloud service. This cloud-based approach enables the broad availability of quantum-computing-as-a-service (QCaaS). The company derives its revenue from its quantum-computing-as-a-service arrangements, consulting services related to co-developing algorithms on company's quantum computing systems and contracts associated with the design, development, and construction of specialized quantum computing systems together with related services. | $31 | -49% | $13B | $11B | 81.6x | (20.0x) | ||
| Littelfuse is a primary provider of circuit protection products (such as fuses and relays) for the transportation, industrial, telecommunications, and consumer electronics end markets. The company is also increasing its power semiconductor business, where it predominantly serves industrial end markets, and is breaking into electric vehicle charging infrastructure. Littelfuse has 17,000 global employees. | $383 | +58% | $9.7B | $9.8B | 4.1x | 56.9x | ||
| D-Wave Quantum Inc is in the development and delivery of quantum computing systems, software, and services, and it is the commercial supplier of quantum computers and the only company building both annealing quantum computers and gate-model quantum computers. It delivers customer value with practical quantum applications for problems as diverse as logistics, artificial intelligence, materials sciences, drug discovery, scheduling, cybersecurity, fault detection, and financial modeling. Its annealing quantum computers are accessible through the company's LeapTM cloud service. | $12 | -68% | $4.5B | $4B | 161.6x | (10.7x) | ||
| Rigetti Computing Inc builds quantum computers and the superconducting quantum processors that power them. The Company sells 9-qubit to 108-qubit quantum computing systems under the Novera and Cepheus trade names. Through the Rigetti Quantum Cloud Services (QCS) platform, the Company's machines can be integrated into any public, private or hybrid cloud. The Company also operates in Fremont, California; London, United Kingdom; Adelaide, Australia; British Columbia, Canada and Mumbai, India. The Company's revenue is derived from operations in the United States and the United Kingdom. | $12 | -74% | $3.9B | $3.5B | 494.6x | (15.6x) | ||
| QuantumScape is a developer of solid-state lithium-metal battery technology intended for electric vehicles and other energy-storage applications. The organization serves B2B customers and counterparties through the operating assets, products, or financial capabilities described in the cited transaction materials. Its principal economics are Product sales, Licensing, while its competitive position depends on sector expertise, asset quality, customer relationships, execution, and disciplined capital allocation. The business was founded in 2010 and is headquartered in San Jose. At the 2020 Series F date the company remained pre-commercial and used strategic capital to scale cell development and manufacturing preparations. The profile reflects the legal or operating business at the transaction date, including its historical identity where a subsequent listing, merger, privatization, disposal, or reorganization changed its name or ownership. | $4 | -78% | $2.5B | $1.7B | - | (4.2x) | ||
| Infleqtion is a quantum technology company that builds neutral atom quantum computers, optical atomic clocks, radio-frequency sensors and inertial sensors, together with the Superstaq quantum software platform. It began in Boulder in 2007 as ColdQuanta, founded by University of Colorado physicist Dana Anderson, and adopted the Infleqtion name in November 2022 as it moved from research hardware toward finished commercial products. The company is headquartered in Louisville, Colorado, with offices in Boulder, Chicago, Madison, Melbourne and Oxford. It raised a US$110 million Series B in 2022 and a US$100 million Series C in June 2025 backed by Counterpoint Global, Glynn Capital, S32, SAIC, In-Q-Tel, Breakthrough Victoria and others, with J.P. Morgan as sole placement agent. Its technology is deployed by NASA on the International Space Station, and it reported almost US$30 million of revenue for 2024 with a customer pipeline above US$200 million. Infleqtion trades on the New York Stock Exchange under the ticker INFQ. | $9 | -- | $2B | $1.5B | 51.6x | (28.5x) | ||
| Quantum Computing Inc is an integrated photonics and quantum optics technology company that provides accessible and affordable quantum machines to the world today. Its products are designed to operate at room temperature and low power at an affordable cost. The Company’s portfolio of core technologies and products offer capabilities in the areas of high-performance computing, artificial intelligence, and cybersecurity, as well as remote sensing applications. | $7 | -61% | $1.5B | $538M | 789.2x | (15.7x) | ||
| Quantinuum is a quantum computing company headquartered in Broomfield, Colorado, with facilities in the United States, United Kingdom, Germany, Japan, Qatar and Singapore. It was formed in 2021 by combining Honeywell Quantum Solutions with Cambridge Quantum Computing. The company builds trapped-ion quantum computers based on the QCCD architecture and offers them alongside its own quantum software, middleware and cybersecurity applications as a full-stack platform. It reports the industry's highest average two-qubit gate fidelity as of 31 December 2025. Its customers include organisations in pharmaceuticals, materials science, financial services, and government and industrial markets. Venture and strategic investors in the company have included IBM Ventures, Honeywell, JPMorgan Chase, Amgen and Mitsui & Co. Quantinuum listed on the Nasdaq Global Market under the ticker QNT in June 2026, when an initial public offering of 28,000,000 Class A shares at USD 60.00 raised gross proceeds of USD 1.68 billion. | $36 | -- | $1.4B | $1.9B | 61.9x | (3.5x) | ||
| Quantum Corp is a United States-based company that delivers end-to-end data management solutions designed for unstructured data in the era of artificial intelligence (AI). It provides one of the comprehensive and cost-efficient solutions for the entire data lifecycle. The group provides solutions for video, images, audio, and other large files because this unstructured data represents. Its portfolio of products includes primary storage software and systems, secondary storage software and systems, as well as devices and media. The group operates in three geographic regions: Americas, Europe, the Middle East, and Africa (EMEA), and Asia Pacific (APAC). | $19 | +101% | $748M | $703M | 2.5x | (9.6x) | ||
| Quantum-Si Inc is a life sciences company focused on the development and commercialization of proteomics research tools. The company has designed and developed a hardware, consumable, and software solution to provide a solution for protein detection and analysis. It has developed a proprietary universal single-molecule detection platform that enables Next-Generation Protein Sequencing (NGPS), the ability to sequence proteins. | $1 | -46% | $254M | $145M | 59.7x | (1.4x) | ||
| Median | $12 | -55% | $2.2B | $1.8B | 61.9x | (10.1x) |
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